September Weather in Machynlleth, United Kingdom

Last updated: March 17, 2025

In September, Machynlleth, United Kingdom, experiences a diverse climate that showcases the transition into autumn. With a maximum temperature reaching 27°C (81°F), the weather can still feel pleasantly warm during the day, while the average hovers around a mild 13°C (55°F). However, evenings can get brisk, dropping to a minimum of 1°C (34°F). This month is also characterized by significant precipitation, receiving about 100 mm (3.9 in) over 15 days, resulting in a notable humidity level of 85% that can make the air feel quite damp. Whether basking in the occasional sun or navigating through the drizzle, September in Machynlleth offers a unique blend of experiences for visitors and residents alike.

September Temperature in Machynlleth

In September, Machynlleth enjoys a pleasant transition from summer to autumn, with temperatures ranging from a minimum of 1°C (34°F) to a comfortable maximum of 27°C (81°F). The average temperature hovers around 13°C (55°F), offering a refreshing yet mild climate ideal for outdoor activities. As the month progresses, the days gradually cool down, mirroring the shift in seasons. This marks a notable contrast to the warmer summer months, providing residents and visitors alike with a perfect opportunity to enjoy the vibrant colors of early autumn without the chill of winter just yet. Overall, September's temperatures encapsulate a delightful blend of warmth and crispness, making it an inviting time to experience the beauty of this Welsh town.

September Weather in Machynlleth: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Machynlleth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404143465157605955504542
Data source: Temperature data for Machynlleth generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Machynlleth

September in Machynlleth typically brings a notable blend of rain, with an average precipitation of 100 mm (3.9 in) over about 15 days. This amount places it comfortably within the wetter months, following the deluge of August which saw 119 mm (4.7 in). As summer transitions into autumn, September’s rainfall often marks the beginning of a trend toward increased precipitation, foreshadowing the heavier downpours to come in October and December, which average 134 mm (5.3 in) and 147 mm (5.8 in) respectively. Overall, September serves as a reminder of the Region's lush, green landscape, sustained by its consistent and abundant rainfall.

September Precipitation Trends in Machynlleth

The chart displays monthly precipitation patterns in Machynlleth, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec8912712461849586120100134117147
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Machynlleth

As September arrives in Machynlleth, the air begins to feel noticeably more humid, with levels averaging 85%. This marks a slight increase from the summer months, where humidity dipped to its lowest at 78% in July. The trend reveals that as autumn approaches, the moisture in the atmosphere begins to rise again, setting the stage for the wetter months ahead. Following September, humidity reaches its peak, soaring to 90% in October, aligning with the seasonal transitions that characterize this charming Welsh town. This pattern highlights a gradual shift from the dry warmth of summer to the cool, damp embrace of autumn, offering a refreshing change in the climate.

September Average Humidity in Machynlleth

This chart illustrates the average monthly humidity levels in Machynlleth, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Machynlleth

As September rolls into Machynlleth, the UV Index remains at a high level of 6, similar to that of April, reflecting a transitional weather pattern as summer wanes. With a burn time of just 25 minutes, it's crucial to remain vigilant about sun protection, even as the temperature begins to drop. This month continues the trend of elevated UV exposure seen in the summer, particularly in June and July, which reached a peak of 8. As the days shorten, the UV Index starts to taper off, indicating a shift towards more moderate levels in the coming months. For detailed insights on your sun care needs, check out the Machynlleth UV Index.

Maximum UV Index Levels in Machynlleth for September

The chart shows the monthly maximum UV Index (UVI) for Machynlleth in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Machynlleth September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Machynlleth

In Machynlleth, United Kingdom, September offers a beautiful transition from the vibrant summer months to the cooler autumn days, with an impressive 292 hours of sunshine. This month stands out as a notable shift, maintaining a rich tapestry of light that follows the peak of summer, particularly July, which basks in the highest sunshine at 402 hours. As the days shorten, September provides a gentle reduction in sunlight, down from August's 360 hours, making it a perfect time for outdoor activities amid the lingering warmth. The gradual decline leads into the autumn months, where sunshine dips significantly, dropping to 220 hours in October and even lower as winter approaches. This trend highlights September's charm, with its ample sunlight, and reinforces its role as a bridge between seasons, inviting both locals and visitors to relish the last rays of summer.

Monthly Sunshine Duration in Machynlleth: September Highlighted

The September sunshine duration represents the total number of hours Machynlleth experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec84h138h200h311h386h370h402h360h292h220h114h94h
Data source: Machynlleth September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Machynlleth During September

In September, Machynlleth experiences a 20% chance of sunny weather, reflecting a slight dip from the peak of 47% in April. As summer winds down, the likelihood of sunshine gently declines, following a trend seen in the months leading up to autumn. While still relatively favorable compared to the gloomier winter months, with only 14% in December, September offers a modest opportunity for enjoying the outdoors under clearer skies. This transitional month hints at the balance between lingering summer warmth and the approaching chill of autumn, making it an intriguing time for weather enthusiasts and visitors alike.

Percentage of Sunny Days in September in Machynlleth

The chart illustrates the percentage of sunny days in Machynlleth throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Machynlleth experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec16%18%24%47%26%22%35%21%20%15%21%14%
Data source: Machynlleth September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Machynlleth in September

As September unfolds in Machynlleth, United Kingdom, residents can enjoy approximately 12 hours of daylight, a gentle transition from the long summer days of 16 hours in June and July. This month marks a significant shift as daylight begins to wane, with 14 hours in August already hinting at the impending autumn. The trend reveals a gradual but steady decline in daylight as the year progresses, ultimately leading us back to the shorter days of winter, which see only 7 hours of daylight in December. Thus, September serves as a bittersweet reminder of summer's end, offering a perfect balance of light and shadow as the seasons change.

Average Daylight Hours in Machynlleth for September

The chart illustrates the variation in daylight duration in Machynlleth throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 14m9h 53m11h 54m13h 58m15h 47m16h 44m16h 13m14h 36m12h 36m10h 33m8h 42m7h 42m
Data source: Machynlleth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Machynlleth

As summer gracefully transitions into autumn, September in Machynlleth brings a gentle breeze with an average wind speed of 2.9 m/s (7 mph). This is a slight dip compared to the preceding months, reflecting a trend where wind speeds gradually decline from the summer highs of July and August. While April and June exhibited some of the calmest winds of the year, September maintains a balanced breath of air that hints at the changing seasons. The wind whispers through the trees and invites residents and visitors alike to embrace the enchanting charm of early autumn, paving the way for a gradual rise in gusts as October approaches.

Average September Wind Speed in Machynlleth

The chart displays monthly wind speed patterns in Machynlleth, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.15.04.33.13.73.02.53.42.9 m/s4.43.74.4
Data source: Machynlleth September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Machynlleth Compares to Other Months

The weather in Machynlleth changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Machynlleth and find detailed weather information for every month.

September and January present contrasting weather patterns. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 27°C (81°F), with an average of 13°C (55°F). The month sees about 100 mm (3.9 in) of precipitation over 15 days, while humidity sits at 85%. Conversely, January is significantly colder, with temperatures ranging from -5°C (24°F) to 13°C (56°F) and an average of 4°C (40°F). Precipitation is slightly lower at 89 mm (3.5 in) over 13 days, and humidity increases to 89%. For more details on January weather, visit Machynlleth weather in January.

In September, temperatures in Machynlleth range from a mild minimum of 1°C (34°F) to a warm maximum of 27°C (81°F), with an average of around 13°C (55°F). The month sees about 100 mm (3.9 in) of precipitation over approximately 15 days, with humidity levels at 85%. In contrast, February experiences colder conditions, with temperatures dropping to a minimum of -7°C (20°F) and peaking at 17°C (63°F), averaging around 5°C (41°F). This month is also wetter, with 127 mm (5.0 in) of precipitation falling across 17 days and humidity slightly higher at 88%. For more information on February weather, you can check Machynlleth weather in February.

September and March present distinctly different weather conditions. September typically features milder temperatures, ranging from a minimum of 1°C (34°F) to a maximum of 27°C (81°F), with an average of 13°C (55°F). In contrast, March is much cooler, with temperatures ranging from a minimum of -7°C (19°F) to a maximum of 19°C (66°F), averaging 6°C (43°F). While both months experience significant rainfall, March has slightly more precipitation at 124 mm (4.9 in) over 18 days compared to September's 100 mm (3.9 in) over 15 days. Additionally, humidity levels are quite similar, with September at 85% and March at 86%. For a closer look at the weather specifics in March, you can visit Machynlleth weather in March.

September and April exhibit notable differences in their weather patterns. September tends to be warmer, with average temperatures ranging from a chilly 1°C (34°F) at night to a comfortable 27°C (81°F) during the day, while April features cooler temperatures, with a minimum of -3°C (27°F) and a maximum of 22°C (71°F). Precipitation is also more abundant in September, receiving around 100 mm (3.9 in) over approximately 15 days, compared to April's 61 mm (2.4 in) over 11 days. Humidity levels are quite similar, hovering around 85% in September and 84% in April. For more specific insights into April's weather, you can check Machynlleth weather in April.

In comparing the weather of September and May, September typically boasts warmer temperatures with an average of 13°C (55°F) and a maximum of 27°C (81°F), while May has a slightly cooler average of 11°C (52°F) and a maximum of 26°C (78°F). Interestingly, September tends to experience more precipitation, averaging 100 mm (3.9 in) over 15 days compared to May's 84 mm (3.3 in) across 13 days. Additionally, September's higher humidity level at 85% contrasts with May's 79%, making the former feel more humid overall. For specific information on Machynlleth, you can check Machynlleth weather in May.

In June, weather in Machynlleth is slightly warmer with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 28°C (82°F), and an average of 14°C (57°F). The month sees about 95 mm (3.8 in) of precipitation over 15 days, with humidity at 81%. In contrast, September experiences a broader temperature range, with lows dropping to 1°C (34°F) and highs reaching 27°C (81°F), averaging at 13°C (55°F). While September receives a similar amount of precipitation at 100 mm (3.9 in) over the same number of days, it has a higher humidity level at 85%. For those interested in more specific June weather details, check out Machynlleth weather in June.

In comparing the weather of September and July, September experiences slightly cooler temperatures with a minimum of 1°C (34°F) and an average of 13°C (55°F), while July's minimum temperature is 5°C (42°F) and averages around 16°C (60°F). Both months have similar maximum temperatures, with September peaking at 27°C (81°F) and July at 28°C (83°F), indicating that the warmth extends into the early fall. However, September sees more precipitation, totaling 100 mm (3.9 in) over 15 days compared to July's 86 mm (3.4 in) over 14 days, suggesting a wetter end to summer. Additionally, September has higher humidity at 85% compared to July's 78%, making for a more humid atmosphere during the former month. For more detailed insights, you can check Machynlleth weather in July.

In comparing the weather of September and August, it's evident that September experiences cooler minimum temperatures, dropping to 1°C (34°F), while August has a milder minimum of 6°C (42°F). However, both months share the same maximum temperature of 27°C (81°F). September sees an average temperature of 13°C (55°F), slightly lower than August's average of 15°C (59°F). Precipitation is also notable, with September receiving 100 mm (3.9 in) over 15 days, compared to August's 119 mm (4.7 in) over 19 days. Additionally, September has a higher humidity level at 85%, while August's humidity stands at 79%. For more details on August's weather, you can visit Machynlleth weather in August.

As September transitions into October, the weather experiences a notable shift. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 27°C (81°F), with an average of 13°C (55°F). The month sees about 100 mm (3.9 in) of precipitation over 15 days and maintains a humidity level of 85%.

In contrast, October brings cooler conditions, with temperatures dipping to a minimum of -4°C (25°F) and a maximum of 21°C (70°F), resulting in an average of 10°C (50°F). This month is also wetter, receiving approximately 134 mm (5.3 in) of precipitation over 18 days, along with slightly higher humidity at 90%. For more specific details, you can explore Machynlleth weather in October.

In September, the weather is generally milder with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 27°C (81°F), resulting in an average of 13°C (55°F). The month sees around 100 mm (3.9 in) of precipitation over about 15 days, with humidity levels around 85%. In contrast, November brings a noticeable chill with temperatures dipping to a minimum of -3°C (27°F) and an average of 7°C (45°F). The maximum temperature in November reaches only 15°C (59°F), and precipitation increases slightly to 117 mm (4.6 in) over approximately 18 days, accompanied by higher humidity levels at 91%. For more detailed information, you can visit Machynlleth weather in November.

In September, the weather is generally milder, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 27°C (81°F), and an average of 13°C (55°F). The month experiences about 100 mm (3.9 in) of precipitation over approximately 15 days, contributing to a humidity level of 85%. In contrast, December brings colder temperatures, with a minimum of -6°C (22°F) and a maximum of 12°C (54°F), leading to an average temperature of 6°C (42°F). This month sees increased precipitation of 147 mm (5.8 in) over 19 days, and humidity rises slightly to 89%. For more detailed insights, visit Machynlleth weather in December.

Compare Machynlleth's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Machynlleth

As September arrives in Machynlleth, the weather transitions from the warmth of summer to the cooler embrace of autumn. Temperatures begin to dip, with an average that shifts significantly lower than the peak summer months, offering a refreshing respite from the heat. However, this month also brings increased precipitation, with several rainy days contributing to the lush greenery characteristic of the region. Humidity levels remain relatively high, creating a distinct atmosphere that can feel both invigorating and damp. For those looking to explore Machynlleth's unique September climate, it's an excellent time to experience the vibrant changes in nature. For more detailed insights, visit Machynlleth Climate.